Related Clues:
- Marine polyps, often forms reefs
- Substance formed by skeletons of tiny sea creatures
- It grows in water, in a manner of speaking, after a century
- This build-up in the water takes a century, in a manner of speaking
- Are shortly in the fuel from the bottom of the sea
- After a century, in a manner of speaking, it might make an island
- See, it's spoken for one sort of island
- What's in mine are shortly all that's in 13 across
- See how spoken this is underwater
- Like many beaches
- Granular
- See 3 Down
- Marine colony former
- Atoll's composition
- Well I'm blowed! Bald, shaved and pink!